运河;灌溉渠 a long straight passage dug in the ground and filled with water for boats and ships to travel along; a smaller passage used for carrying water to fields, crops, etc.
the Panama/Suez Canal 巴拿马 / 苏伊士运河
an irrigation canal 一条灌溉渠
导管;食道;气管 a tube inside the body through which liquid, food or air can pass